Secure Empty Trash wouldn’t just delete the file’s index, but also would overwrite it a single time with zeroes. Secure Empty Trash (hold down the Command key while emptying the Trash) is no longer available in OS X El Capitan. The space is available for other files, but someone could still recover the data from magnetic spinning media, or at least read some of the deleted files using basic disk repair or disk analysis software. When you perform a normal Empty Trash operation, the file isn’t immediately overwritten on your HDD rather, the disk’s index, created as part of the formatting operation, has its entry for that file removed. Secure Empty Trash was originally designed around hard disk drives (HDDs).
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